College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 2 - Section 2.4 - Inertia and Equilibrium: Newton's First Law of Motion - Practice Problem - Page 40: 2.6

Answer

The force exerted on the crate by the bed of the pickup truck is an upward force of $80~N$ We can see a free body diagram for the crate below.
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Work Step by Step

Since the crate stays at rest, the net force on the crate must be zero. Therefore, the force exerted on the crate by the bed of the pickup truck is an upward force which is equal in magnitude to the weight of the crate. Then the net force on the crate is zero. The force exerted on the crate by the bed of the pickup truck is an upward force of $80~N$ We can see a free body diagram for the crate below.
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